1321140243 has 8 divisors (see below), whose sum is σ = 1854232000. Its totient is φ = 834404328.

The previous prime is 1321140221. The next prime is 1321140259. The reversal of 1321140243 is 3420411231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321140243 - 2¹⁰ = 1321139219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321140283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11588893 + ... + 11589006.

It is an arithmetic number, because the mean of its divisors is an integer number (231779000).

Almost surely, 2^1321140243 is an apocalyptic number.

1321140243 is a deficient number, since it is larger than the sum of its proper divisors (533091757).

1321140243 is a wasteful number, since it uses less digits than its factorization.

1321140243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23177921.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1321140243 is about 36347.4929396788. The cubic root of 1321140243 is about 1097.2770787875.

Adding to 1321140243 its reverse (3420411231), we get a palindrome (4741551474).

The spelling of 1321140243 in words is "one billion, three hundred twenty-one million, one hundred forty thousand, two hundred forty-three".